Sir Grafton Elliot Smith was an Australian-British anatomist, Egyptologist and a proponent of the hyperdiffusionist view of prehistory. He believed in the idea that cultural innovations occur only once and that they spread geographically. Based on this, he traced the origins of many cultural and traditional practices across the world, including the New World, to ideas that he believed came from Egypt and in some instances from Asia. An expert on brain anatomy, he was one of the first to study Egyptian mummies using radiological techniques. He took an interest in extinct humanoids and was embroiled in controversy over the authenticity of the Piltdown Man.

The Piltdown Man was a paleoanthropological fraud in which bone fragments were presented as the fossilised remains of a previously unknown early human. Although there were doubts about its authenticity virtually from the beginning, the remains were still broadly accepted for many years, and the falsity of the hoax was only definitively demonstrated in 1953. An extensive scientific review in 2016 established that amateur archaeologist Charles Dawson was responsible for the fraudulent evidence.